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7d35b8d0 SS |
1 | /* |
2 | * OMAP4 SMP cpu-hotplug support | |
3 | * | |
4 | * Copyright (C) 2010 Texas Instruments, Inc. | |
5 | * Author: | |
6 | * Santosh Shilimkar <santosh.shilimkar@ti.com> | |
7 | * | |
8 | * Platform file needed for the OMAP4 SMP. This file is based on arm | |
9 | * realview smp platform. | |
10 | * Copyright (c) 2002 ARM Limited. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/smp.h> | |
7d35b8d0 SS |
20 | |
21 | #include <asm/cacheflush.h> | |
4e65331c TL |
22 | |
23 | #include "common.h" | |
7d35b8d0 | 24 | |
b5b4f288 SS |
25 | #include "powerdomain.h" |
26 | ||
7d35b8d0 SS |
27 | int platform_cpu_kill(unsigned int cpu) |
28 | { | |
3c030bea | 29 | return 1; |
7d35b8d0 SS |
30 | } |
31 | ||
32 | /* | |
33 | * platform-specific code to shutdown a CPU | |
34 | * Called with IRQs disabled | |
35 | */ | |
82dfcbfe | 36 | void __ref platform_cpu_die(unsigned int cpu) |
7d35b8d0 | 37 | { |
b5b4f288 SS |
38 | unsigned int this_cpu; |
39 | ||
7d35b8d0 SS |
40 | flush_cache_all(); |
41 | dsb(); | |
42 | ||
43 | /* | |
44 | * we're ready for shutdown now, so do it | |
45 | */ | |
46 | if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0) | |
b5b4f288 | 47 | pr_err("Secure clear status failed\n"); |
7d35b8d0 SS |
48 | |
49 | for (;;) { | |
50 | /* | |
b5b4f288 | 51 | * Enter into low power state |
7d35b8d0 | 52 | */ |
b5b4f288 SS |
53 | omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF); |
54 | this_cpu = smp_processor_id(); | |
55 | if (omap_read_auxcoreboot0() == this_cpu) { | |
7d35b8d0 SS |
56 | /* |
57 | * OK, proper wakeup, we're done | |
58 | */ | |
59 | break; | |
60 | } | |
61 | pr_debug("CPU%u: spurious wakeup call\n", cpu); | |
62 | } | |
63 | } | |
64 | ||
65 | int platform_cpu_disable(unsigned int cpu) | |
66 | { | |
67 | /* | |
68 | * we don't allow CPU 0 to be shutdown (it is still too special | |
69 | * e.g. clock tick interrupts) | |
70 | */ | |
71 | return cpu == 0 ? -EPERM : 0; | |
72 | } |